add brightness controls to sway

dotfiles/sway/.config/sway/config

@@ -231,6 +231,10 @@ bindsym XF86AudioNext exec --no-startup-id 'rhythmbox-client --no-start --next'
 bindsym $mod+shift+s exec --no-startup-id 'grim -g "$(slurp)" - | wl-copy'
 bindsym $mod+ctrl+shift+s exec --no-startup-id 'grim - | wl-copy'
 
+#brightness
+bindsym XF86MonBrightnessUp exec --no-startup-id 'sudo brightnessctl -d intel_backlight s +5%'
+bindsym XF86MonBrightnessDown exec --no-startup-id 'sudo brightnessctl -d intel_backlight s 5%-'
+
 #for gaming
 for_window [workspace="9"] floating enable
 for_window [workspace="10"] floating enable